Servis dryer timer ‘on speed’

Servis M2002w, the mechanical timer seems to be romping through its time segments at about 4 times the speed it should 😯 Works ok otherwise according to cust, didnt have much time to look at it properly as i was there doing her dishwasher.
I would assume it needs a new timer but wondered if an earth fault on some other component might give the same symtoms.. strange one 😕

Thanks, Eddie.